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Preguica-ar Xiv 2010






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Preguica-ar Xiv 2010

Dotted Version Vectors: Logical Clocks for Optimistic Replication

Preguiça, Baquero, Almeida, Fonte, Gonçalves

eventual consistency causality optimistic asynchronous replication

  author={Nuno M. Pregui{\c{c}}a and
          Carlos Baquero and
          Paulo S{\'{e}}rgio Almeida and
          Victor Fonte and
          Ricardo Gon{\c{c}}alves},
  title={Dotted Version Vectors: Logical Clocks for Optimistic Replication},
  institution={Universidade Nova de Lisboa},


In cloud computing environments, a large number of users access data stored in highly available storage systems. To provide good performance to geographically disperse users and allow operation even in the presence of failures or network partitions, these systems often rely on optimistic replication solutions that guarantee only eventual consistency. In this scenario, it is important to be able to accurately and efficiently identify updates executed concurrently. In this paper, first we review, and expose problems with current approaches to causality tracking in optimistic replication: these either lose information about causality or do not scale, as they require replicas to maintain information that grows linearly with the number of clients or updates. Then, we propose a novel solution that fully captures causality while being very concise in that it maintains information that grows linearly only with the number of servers that register updates for a given data element, bounded by the degree of replication.

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